Bobbin winder



Patented Mar. d, 1924.

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HARRY W. KRAG, OF ST. LOUIS, MISSOURI, ASSIGNOB TO AMERICAN SHOE IVIAOHINERY & TOOL COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

BOBBIN wrnnna.

Application filed. October 2, 1922. Serial No. 591,803.

To all whom it may concern:

Be it known that I, HARRY W. KRAG, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Bobbin Winders, of which the following is a specification.

This invention relates to sewing machines employing a shuttle and bobbins and to means operated by the sewing machine for winding thread upon the bobbins. The principal object of the present invention is to provide the sewing machine with a simple and efficient means for winding the bobbin employed therein which can be readily connected to the continuously operating mechanism of the machine to be operated thereby. The invention consists principally in the improved bobbin winding mechanism hereinafter shown and described; and it also consists in the parts and in the combinations and arrangements of parts hereinafter described and claimed.

In the accompanying drawing, which forms part of this specification and wherein like symbols refer to like parts wherever they occur.

Fig. 1 is a plan view of the stitcher-head portion of a sewing machine provided with a bobbin winding mechanism embodying my invention;

Fig. 2 is a side elevation thereof; and

F ig. 3 is a vertical longitudinal section through the bobbin supporting mechanism on the line 33 in Fig 2.

Referring to the accompanying drawing, my invention is: shown in connection with a sewing machine of the lock-stitch wax-thread type employing a shuttle and bobbins, only the stitcher-head portion i of the machine and the continuously rotating counter shaft 5 thereof being shown. Projecting horizontally from one side of the stitcher-head, near the front corner thereof, is a pivotstud 6, upon which is fulc-rumed a bent lever 7. One arm of this lever projects forwardly and constitutes a handle for rocking the lever on its fulcrum and the other arm of the lever projects upwardly and is provided with a cylindrical extension 8. The extension 8 is disposed parallel with the fulcrum pin 6 and has an axial bore within which is journaled a bobbin receiving shaft 9. The inner end of the shaft 9 is provided with a collar 10 adapted to prevent outward movement thereof; and the outer end of said shaft has a grooved pulley 11 fixed thereto. The shaft 9 extends beyond the outer face of the pulley 11 a distance sufficient to accommodate a bobbin (not shown). Projecting from the front face of the pulley 11 is a pin 12 which is adapted to enter a hole in the bobbin and thus secure the bobbin to its supporting shaft 9 for rotation therewith.

Threaded into the front face of the stitcher-he'ad, back of the collar 10 is a stopscrew 13 adapted to limit rearward swing ing movement of the upper arm of the bent lever and the parts supported thereon. Supported on a horizontal flange of the stitcher head, below the operating arm of the bent lever, is a. coiled expansion spring 14:. This spring bears against the under side of the operating arm of the lever and serves to force the collar 10 on the bobbin supporting shaft 9 rearward against the stop-screw13.

Located rearwardly of the bobbin supporting shaft is a stub-shaft 15 that projects horizontally from the side of the stitcherhead. Journaled on the stub-shaft is an idler pulley 16 provided with two belt receiving grooves. The bobbin shaft pulley 11 is connected with the idler pulley 16 by a normally slack or loose belt 17 that passes around the single groove in said bobbin shaft pulley and the outer groove in said idler pulley. The idler pulley 16 receives its motion through a belt 18 from a driving pulley 19 fixed to the continuously rotating counter shaft 5 of the sewing machine. This belt is received within the single groove of the driving pulley 19 and the inner groove of the idler pulley 16.

The device is used as follows: With the parts in the positions shown in the drawing, motion of the continuously rotating idler pulley 16 is not transmitted to the bobbin shaft pulley 11 by reason of the loose belt connection 17 therebetween. Rotation of the bobbin receiving shaft pulley is also resisted by the stop-screw 13 which, in the normal position of the device, contact with the collar 14: on said shaft 9 and thus serves as a brake therefor. When it is desired to wind the bobbin, the bobbin is slipped on the end of the bobbin receiving shaft 9 with the pin 12 entered within the hole provided therefor in the bobbin. The operating arm of the bent lever 7 is then depressed, which action causes the other arm of the lever and the bobbin shaft pulley 11 supported thereon to swing away from the continuously rotating idler pulley 16 a distance sufficient to take up the slack in the loose belt 17 and thereby force the bobbin receiving shaft to rotate with the continuously rotating idler pulley. When the pressure on the operating arm of the bent lever is released, the lever is returned to its normal position, with the bobbin shaft collar 11 in engagement with the adjustable stop-screw 13, by the spring 14:, thereby shortening the center to center distance between the bobbin shaft pulley 11 and the idler pulley 16, which action causes the belt 17 which connects said pulleys to slacken an amount sufficient to prevent movement of the belt with the continuously rotating idler pulley and the operation of the bobbin supporting shaft thereby.

Obviously, the construction herein described admits of considerable modification without departing from the invention.

What I claim is:

1. A sewing machine comprising a continuously rotating shaft, a bobbin winding shaft disposed parallel with said continuously rotating shaft, a normally slack belt connecting said shafts, and means for taking up the slack in said belt and thereby cause said bobbin winding shaft to rotate.

2. A sewing machine comprising a con tinuously rotating shaft, a bobbin winding shaft disposed parallel with said continuously rotating shaft, a normally slack belt connecting said shafts, and means for swinging said bobbin receiving shaft transversely of said continuously rotating shaft to take up the slack in said belt and thereby cause said bobbin winding shaft to rotate,

3. A sewing machine comprising a con tinuously rotating shaft, a bobbin winding shaft disposed parallel with said contin-.

uously rotating shaft, a normally slack belt connecting said shafts, and means for increasing the normal distances between said shafts to tighten the belt thereon and thereby cause said bobbin winding shaft to rotate.

4:. A sewing machine comprising a continuously rotating shaft, a bobbin winding shaft disposed parallel with said continuously rotating shaft, a normally slack belt connecting said shafts, said shafts being arranged for relative transverse movement whereby the distance between said shafts may be increased an amount sufficient to take up the slack in said belt and thereby cause the bobbin winding shaft to rotate.

5. A sewing machine comprising a continuously rotating shaft, a bobbin winding shaft disposed parallel with said continuously rotating shaft, a normally slack belt connecting said shafts, and a lever support for said bobbin winding shaft, said lever support being arranged for swinging movemont transversely of said continuously rotating shaft, whereby the slack in said belt may be taken up to cause saidbobbin winding shaft to rotate.

6. A sewing machine comprising a frame having a continuously rotating drive shaft journaled therein, a bent lever fulcruined on said frame for swinging movement transversely of said shaft, a bobbin winding shaft journaled in one of the arms of said lever and disposed parallel with said shaft, a normally slack belt connecting said bobbin winding shaft with said driving shaft, an adjustable stop for limiting the swinging movement of said bobbin winding shaft in the direction of said drive shaft, and means for yieldably normally holding said bobbin winding shaft in contact with said adjustable stop. I

7. A sewing machine comprising a frame having a continuously rotating drive shaft journaled therein, an idler pulley journaled on said frame, a belt connecting said shaft with said pulley, a bobbin winding shaft disposed parallel with said drive shaft, a normally slack belt connecting said bobbin winding shaft with said idler pulley, and a lever rotatably supporting said bobbin winding shaft, said lever being fulcrumed on said frame for swinging movement transvcrsely of said drive shaft to take up the slack in said slack beltand thereby cause said bobbin shaft to rotate.

Signed at St. Louis, Mo. this 30th day of September, 1922.

HARRY W. KRAG. 

